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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e74e03a00e93d720b20cf41bad33bf2d11e2abb5d46a74b7ab84c91f98ff4ba7' 
  AND token = 'DpnjBdPjf2DXQ1QRD3Zix8LNT6uL96QJRSxIhaMsceQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}